WPF FontFamily 格式问题

发布于 2024-09-13 08:36:48 字数 669 浏览 4 评论 0原文

我正在尝试设置“字体系列”组合框的选定值，该值已使用以下 XAML 填充：

<ComboBox ItemsSource="{x:Static Fonts.SystemFontFamilies}" Name="cboFont">
    <ComboBox.ItemsPanel>
        <ItemsPanelTemplate>
            <VirtualizingStackPanel MinWidth="256" />
        </ItemsPanelTemplate>
    </ComboBox.ItemsPanel>
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Margin="2" Text="{Binding}" FontFamily="{Binding}"/>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

我必须将组合框设置为的字段是一个字符串，但这会导致 FormatExceptions。谁能快速告诉我组合框需要什么类以及如何将字符串（例如“Arial”）转换为该格式？

原文

I'm trying to set the selected value of my Font Family combobox, which has been populated with the following XAML:

<ComboBox ItemsSource="{x:Static Fonts.SystemFontFamilies}" Name="cboFont">
    <ComboBox.ItemsPanel>
        <ItemsPanelTemplate>
            <VirtualizingStackPanel MinWidth="256" />
        </ItemsPanelTemplate>
    </ComboBox.ItemsPanel>
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Margin="2" Text="{Binding}" FontFamily="{Binding}"/>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

The field I have to set the combobox to is a string, but that causes FormatExceptions. Can anyone quickly tell me what class the combobox will be expecting and also how to convert a string e.g. "Arial" to that format?

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我纯我任性 2024-09-20 08:36:49

希望我正确理解了你的问题。

FontFamily 支持构造函数

FontFamily(String familyName);

，因此您应该能够使用 new FontFamily("Arial") 之类的方法从字符串转换为 FontFamily。

您可以将其放入一个实现 IValueConverter 的类中，该类在 FontFamily 和 String 之间进行转换。

要从 FontFamily 获取字符串，您可以访问 FamilyNames 属性来获取特定于特定文化的字体名称。

然后只需设置您的 FontFamily 绑定即可使用转换器。

Hope I've understood your question correctly.

FontFamily supports the constructor

FontFamily(String familyName);

So you should be able to use something like new FontFamily("Arial") to convert from a string to a FontFamily.

You could put that in a class which implements IValueConverter which converts between FontFamily and String.

To get from FontFamily to string, you can access the FamilyNames property to get a name for the font which is specific to a particular culture.

Then just set your FontFamily binding to use the converter.

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够运 2024-09-20 08:36:49

亚历克斯的回答听起来很好。

您还可以尝试 DependencyProperty：

   public FontFamily FontFamily
        {
            get { return (FontFamily)GetValue(FontFamilyProperty); }
            set { SetValue(FontFamilyProperty, value); }
        }

 public static DependencyProperty FontFamilyProperty =
            DependencyProperty.Register(
            "FontFamily",
            typeof(FontFamily),
            typeof(YourClassVM),
             new FrameworkPropertyMetadata(SystemFonts.MessageFontFamily
        , FrameworkPropertyMetadataOptions.AffectsRender |
        FrameworkPropertyMetadataOptions.AffectsMeasure)
            );

然后您只需绑定 Combobox 的 SelectedItem 和 TextBlock 的 Text 和 FontFamily强>到“FontFamily”。

Alex' answer sounds very good.

You could also try a DependencyProperty:

   public FontFamily FontFamily
        {
            get { return (FontFamily)GetValue(FontFamilyProperty); }
            set { SetValue(FontFamilyProperty, value); }
        }

 public static DependencyProperty FontFamilyProperty =
            DependencyProperty.Register(
            "FontFamily",
            typeof(FontFamily),
            typeof(YourClassVM),
             new FrameworkPropertyMetadata(SystemFonts.MessageFontFamily
        , FrameworkPropertyMetadataOptions.AffectsRender |
        FrameworkPropertyMetadataOptions.AffectsMeasure)
            );

Then you simply bind the SelectedItem of your Combobox and the Text and FontFamily of your TextBlock to "FontFamily".

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